Benzimidazolone derivatives



lile ltifil xa United 5 BENZIMIDAZOLONE DERIVATIVES Hein L. Klopping, Wilmington, Del., assignor to E. I. du Pont de Nemonrs and Company, Wilmington, Del., a corporation of Delaware No Drawing. Application February 12, 1958 Serial No. 714,702

1 Claim. (or. 260-299) vThis invention relates to chelates of esters of 2-aminobenzimidazole carboxylic acids, and to fungicidal compositions and methods employing these enemas? It has been found that compounds represented by the following formula possess outstanding fungicidal activityz.

Formula I Q vi-1 Ill wherein X is selected from the group consisting of hydrogen, halogen, nitro, alkyl groups containing 1 through 6 carbon atoms and alkoxy groups containing 1 through 6 carbon atoms; n is a whole positive integer lessthan 5, that is 1, 2, 3 or 4; one Q is --COOR, one Q is M, and the remaining Q is hydrogen; R is an aliphatic radical of lessthan 6 carbon atoms; and M is a cation that forms metal ions containing other coordinated groups, i.e., [Zn(NH [Co(ethylenediamine) and combinations of the above, i.e., [Cu(OI-I) (H O)]+, 2 4)( z )2L 3)( 2 )21 [Cr(OH) (H O) [Cu(H O) (dimethylformamide)]++. Nitrogenous bases having a basicity constant greater than 10'" include ammonia, alkyl substituted ammonium, ethylenediamine, piperazine, benzylamine, etc. It should be understood that the species described above are in the form in which they exist (as the product) in combination with the 2-aminobenzimidazole carboxylic acid esters, and .not necessarily the species used in the preparation of the products.

' R, an aliphatichydrocarbon radical of less than 6 carbon atoms, can be an alkyl such as methyl, ethyl, p-fchloroethyl, propyl, butyl, isopropyl, amyl and n-hexyl.

' 2,933,502 ented Apr. 19, 1960.

Alternatively, R can be an alkenyl, such as vinyl, allyl' and butenyl or an alkinyl such as propargyl.

It will be understood that the above structure may exist in two tautomeric forms since at least one Q is always hydrogen.

Formula II The metal derivatives of Formula I are prepared readily from the corresponding organic molecules by dissolving the appropriate ester and the desired cation separately in suitable solvents, mixing solutions in appropriate molecular proportions, and isolating the metal derivative formed by filtration or evaporation. In certain cases, illustrated by the examples which follow below, it is advantageous to prepare heavy metal chelates via the alkali metal salts of the esters rather than directly from the esters.

The organic molecules used as intermediates in the preparation of the metal derivatives of Formula I can be prepared by a number of routes. For example, the l-substituted esters are conveniently prepared by reacting a Z-aminobenzimidazole and an alkyl chloroformate, either in the absence or the presence of a base, in ac cordance with the following scheme:

In this scheme X, n and R have the same significance as in Formula I. v

The above reactions may be carried out in a great many different solvents such as water, acetone, methanol, ethanol, chloroform, dioxane, DMF and many others. Mixtures of these solvents can also be used, e.g., aqueous acetone or a mixture of chloroform and water. These mixtures are particularly suitable in cases where the base used is soluble only in water.

Suitable bases are sodium hydroxide, sodium acetate, sodium carbonate, postassium carbonate, sodium bicarbonate, trimethylamine, triethylamine, pyridine and many others. These bases may be used either as such or in the form of a solution in a suitable solvent.

The reaction temperature is in general not critical and may be anywhere in between the freezing point and the boiling point of the reaction mixture, provided this boiling point is below the temperature at which reactants and products decompose. As is well known, alkyl chloro-' formates tend to decompose in certain solvents such as dimethylformamide (DMF) at room temperature and above. Accordingly, when dimethylformamide (DMF) is being used, cooling to a temperature in the neighbor- SEARZIH UM hood of C. or less helps" avoid undue losses of alkyl chloroformate. Likewise, alkyl chloroformates are relatively unstable in hot water, particularly under basic conditions,

"As illustrated by the above scheme, the compounds of this invention may be prepared; either in the absence or in the presence of a basef In the former case, the hydrochlorides of the products are obtained, which canbe sub sequently neutralized; in the latter case the free esters form. It is also possible to add the alkyl chloroformate and the base, either as such or in solution or suspension, simultaneously to a stirred solution or suspension of the appropriate Z-aminobenzimidazole. Because of the ease and rapidity with which these reactions take place, they can becarried out continuously, in a pipe reactor, by the simultaneous addition of alkyl chloroformate and base.

The Z-Substituted esters of Formula I are easily prepared according' to the following sequence of reactions:

vi-l The preparation of the intermediate methyl ethers of thiocarbonylbiscarbamic acid esters can be carried out by the method described by Olin and Dains [1. Am. Chem. Soc. 52, 3326 (1930)] for the preparation of the methyl ether of thiocarbonyldinrethane. The reaction of these methyl ethers with the o-phenylenediamines of the above scheme can be carried out as described by Murray and Dains [1. Am. Chem. Soc. 56, 144 (1934)] for the preparation of 2,-benzimidazole-carbamic acid, ethyl ester.

In order that the present invention be more fully understood, reference should be made to the examples which follow below.

As mentioned previously, it has been found that the compounds of this invention possess outstanding fungicidal'activity, controllin'g'a Wide variety of fungus diseasesof plants without damaging thehost.

"Also, certain, of these compounds have exhibited systemicffungicidal activity, a'imique type of activity that heretofore has been found in almost no other compounds. Because of this systemic, activity, fungicidalv control of a plaht'iseprolong'ed incomparison to that obtained with non-systemic fungicides. Asa result, the active fungicidal compounds need be applied much less frequently. Thisis -a result offthe absorption of the fungicidal compound" by the'plant and the resulting translocation of activematerialto newly grown areas. In this same manner, areas of the plant that did not-come into contact with thefungicidal compound because of the lack of complete co erage obtained With mechanical equipment, are pro Inpr'acticmg, thefungicidal methods of my invention,

one 'or'morejof, the. active ingredientsis applied to theor'ganic material tobetreated, for the control of fungi at afdosage suificient to exert fungicidal action. Accordingly, my compositions and. methods are applicable for the protectionofcarbohydrates,'proteins and fats. They are 75 spectrum fungicidal activity. lnthesemixtureahthefungie.

particularly suited for the treating of plants such as vegetables, ornamentals, and fruit-bearing trees. Some of these compositions are also effective when applied directly to the soil for controlling soil-borne pathogenic plant fungi. Also they can be used to treat organic fibers and fabrics, leather and various cellulosic materials such as wood. Likewise they can be used to treat paints and lubricating oils.

In application to plants, fungicidal, control is obtained.

in most instances by spraying the active compound, on the plants in a concentration of from 0.05 to 0.50% active ingredient in the spray. The optimum amount within this range is'l'argely dependent upon the particular fungicidal compound selected, "the method of application, and, in the case of application to vegetation, the state and condition of growth of the vegetation to be treated, and the climatic conditions.

The fungicidal compositions of my invention contain in suflicient amount to exert fungicidal action one or moreof the above-described active compounds in admixture with a carrier material or conditioning agent of the kind used and commonly referredto in the art as a fungia cide adjuvant or modifier. The conventional fungicide adjuvants are inert solids, hydrocarbon liquid diluents and surface-active agents. They provide formulations adapted for ready and efiicient application using conventional applicator equipment. Usually from about 195% by weight of the fungicidal composition is active ingredient.

Solid compositions are preferably in the form of powders. They are compounded as homogeneous powders that can be either used as such, diluted with inert solids to form dusts, or suspended in a suitable liquid medium for spray application. The powders usually comprise active ingredient admixed with some amounts of conditioning agent. Natural clays, either adsorptive such as attapulgite or relatively non-adsorptive such as kaolin clays can be used. Diatomaceous earth, walnut shell fiour, tobacco dust, redwood flour, synthetic fine silica, and other inert solid carriers of the kind conventionallyemployed in powder fungicidal compositions can also be used. The active ingredient usually makes up from about 25-90% of these powder compositions. For conversion of the powders to dusts, talc, pyrophyllite, tobacco dust, volcanic ash and other dense, rapid-settling inert solids customarily are used;

Liquid compositions employing one or more of the fungicidally-active ingredients are prepared by admixing the active ingredientwith a suitable liquid diluent medium.' The active ingredient can be either in solution or in suspension in the liquid medium. Typical of the liquid media commonly employed as fungicide adjuvantsare water, kerosene, Stoddard solvent, xylene, alcohols, alkylated naphthalene and glycols. The active ingredient usually makes up from about 0.5 to 50% of these liquid compositions. Some of these compositions are designed to be used as such, and others to be extended with large quantities of Water.

Compositions in the form of wettable powders or liquids in many cases also include one or more surfaceactive agents such as wetting, dispersing or emulsifying agents. These materials cause the compositions to disperse or emulsify easily in water to give aqueous sprays.

The surface-active agents employed can be of the anionic, cationic or non-ionic type. They include, for example, sodium oleate, sulfonated petroleum oils, alkyl aryl sulfonates, sodium l-auryl sulfate, polyethylene, oxide modified fatty esters, sulfonates, and other surface-active agents. A detailed list of such agents is set forth, in an. article by McCutcheon in Soap and Chemical Specialties, volume 31, Nos. 7-10 (1955).

In some cases it may be desirable to employ the activecompounds of the present invention in combination with other fungicides. to give compositions that have broad eidally active materials can be present in any desired amount, ordinarily from about 01-20 parts by weight of a compound represented by Formula I perpart by weight of the auxiliary fungicidally active material. In some instances'it may even be desirable to employ two or more auxiliary fungicides.

Typical of the auxiliary fungicide's 'that can be employed in combination with the compounds of the present invention are the following:

To a solution of 120 grams (0.9 mole) of 2-aminobenzimidazole in 1700 m1. of acetone are added 90 grams (6% excess over 0.9 mole) of methyl chloroformate while stirring over a period of 2% hours. The temperature is kept at 35 C. by external heating. After stirring for one additional hour, the mixture is filtered with suction. The

solid is washed with acetoneanddried. The white crystalline solid weighs 197 grams (97%), M.P. 140-142 dec.

It consists of Z-amino-l-benzimidazolecarboxylic acid,.

methyl ester, hydrochloride.

The thusly prepared material is dissolved in 750 ml. of

water. While stirring, a 10% aqueous sodium hydroxide solutionis added in a thin stream until a pH of 8.5 is reached. The mixture is filtered with suction. The solid is washed with water and'dried. After recrystallization from chloroform, the compound melts at 163-164 dec- It is 2-amino-1-benzimidazole carboxylic acid, methyl estenl.

A nalysis.--Calcd. for C H N O C, 56.5; H, 4.75; N, 22.0. Found: C, 56.78; H, 4.98; N, 22.03.

To a solution of one molar equivalent of Z-amino-lbenzimidazole carboxylic acid, methyl ester in the minimum volume of warm dirnethylformamide is added a solution of one-half molar equivalent of cupric acetatemonohydrate in the minimum volume of warm dimethylformamide, while stirring. On continued stirring, a light yel- After a suitable incubation period the foliage is examined and it is found'that there is 0% disease'on the treated oli-' age and 100% disease on the untreated foliage.

Example 2 The methyl ether of thiocarbonylbiscarbamic acid di methyl ester is prepared by the method of Olin and Dains [1. Am. Chem. Soc. 52, 3326 (1930)]. It melts at 99- 100. This compound is reacted with an equimolar quantity of o-phenylenediamine in refluxing ethanol following the method of Murrayv and Dains [J Am. Chem. Soc. 56, 144 (1934)]. The product is isolated by filtration, washing with ethanol and water, and drying. The product undergoes slight decomposition resembling sublimation at 215-2l7 and remains virtually unchanged on further heating up to 300. The yield is of 2-benzimidaz0lecarbamic acid, methyl ester.

Analysis.-Calcd. for C H N O C, 56.5; H, 4.75; N, 22.0. Found: C, 56.53; H, 4.88; N, 22.43.

Equimolar quantities of 2-benzirnidazole carbamic acid, methyl ester, and cupric acetate monohydrate are dissovled separately in dimethylformamide. Two molar equivalents of sodium methylate are dissolved in methanol. The carbamic acid ester and the sodium methylate solutions are combined and then the cupric acetate solution is added with stirring. The mixture is then diluted with water. The resulting precipitate, which is 2-benzimidazole carbamic acid, methyl ester 1:1 hydroxycopper II complex monohydrate. is washed with methanol and then with water and air dried. The product analyzes for the composition (C H N O )-CuOHH O. Structure of this compound:

cu-on (kHz A 0.008% by weight water suspension of this chemical is prepared and applied as a spray to the foliage of young apple trees.. When the spray deposit has dried the foliage is inoculated with spores of the apple scab fungus (Venturia inaequalis). After a suitable incubation period the foliage is examined and it is found that the chemical allowed -3% disease whereas unprotected foliage was infected.

A water suspension containing 0.001% by weight of the chemical is applied to the surface of the sand in which cucumber plants are growing. The plants are then exposed to the powdery mildew fungus (Erysiphe lowish-green precipitate forms in the bright green solution,

which is Z-amino-l-benzimidazole carboxylic acid, methyl ester 2:1 copper II complex. The solid is collected on a filter, washed with dimethylformamide, then with methanol and dried. The compound analyzes for the composition (C H N O Cu. pound:

Structure of this com- 1 0.2% .by weight water suspension of this chemical is p, prepared and applied to tomato plant foliage. When the spray deposit has dried, the foliage is inoculated with spores of the early bligh t.'fungus (Alternaria solani).

mixture at a moderate rate.

cichoracearum). After a suitable period of incubation the plants are examined for disease development. It is found that no powdery mildew has appeared on the treatedplants but the untreated plants are 100% diseased. Thus this compound is also effective as a systemic fungicide.

' This same test was repeated with barley plants. It is found that complete control of barley powdery mildew fungus (Erisiphe graminis) is obtained. Treated plants have no disease while untreated plants have 100% disease.

Example 3 Equimolar "quantities of 2 amino l benzimidazole carboxylic acid, methyl ester, cupric acetate monohydrate The sodium methylate solution is added rapidly to the solution of Z-amino-lbenzimidazolecarboxylic acid, methyl ester, mixed thoroughly, and the cupric acetate solution is added to the A deep green precipitate forms immediately, which is '2-amino-l-benzimidazole carboxylic acid, methyl ester, 1:1 hydroxy copper 11 complex' monohydrate. The solid is: collected'on a filter, washed first with methanol, then water, and dried. The compound analyzed for the composition I ing-mixture has adeep brown color but does not yield the precipitated complex. The addition of a large volume of water. tothe solution yields a brown precipitate which isfiltered, washed with water and air dried. It is Z-benzi- 5" midazole "carbamic acid, methyl ester, 2:1 copper II Structure Ofthis compound: complex. The product analyzes for the composition H (CgH N O hCu. Structure of this compound:

CuOH CN=C-OCHa l A) C-- 0, H1O CH3 15' 92 This compound is applied to apple foliage as an aqueous suspension at a concentration of 0.008%.v Thls comPound PP to apple follage i an aqua When thespray deposit has dried, the plants are exposed ous SuSPenSlon, a Qoncentratlon of w to i f ti by the spores f apple powdery mildew the spray deposit has dried, the plants are exposed to mice- (Podosphaera leucotricha). After a suitable incubation 20 y th -spores of the apple s fungus (Vemm'm period it is found that the treated plants have essentially no infection whereas untreated control plants have 100% infection.

Example 4 To one molar equivalent of 2-b en'zimidazole carbamic. acid methyl ester dissolved in the smallest amount of hot dimethylformarnide is added one-half molar equivalent of cupric acetate monohydrate also dissolved in the minimum amount of dimethylforrnamide.- The result? inaequalis). After a suitable incubation period it is foundthat the treated plants have only infection whereas untreated control plants have 100% infection.

The following compounds of the present invention are prepared exactlyin accordance with various of the preced- 'ing examples, as indicated in the following table, by

replacing the reactants of the preceding example with the indicated reactants. The table shows not only the reactants in their relative proportions but also the product obtained.

Method Ex. Starting Materials (moles) of Product No. Example 5 2-benzimidazolecarbamic acid, methyl MnCl1(0.05) 4; 2-benzimidazole carhamic acid, methyl ester1(02.)1) (prepared by method oi Exester, manganese complex. amp e 1 6 do Zn(Ac); (0.05) 4 2 benzimidazole carbamlc acid, methyl ester, zinc complex. 7 do CaCl: (0.05).. .4v Z-benzimidazole carbamic acid, methyl ester, calcium complex. 8 do FeCh (0.05) 4 Z-benzimidazole carbamic acid, methyl r ester, ferrous complex. 9 -.do C001 (0.05)...-- 4 2-bcnzin1idazole carbamic acid, methyl K ester, cobalt complex. 10 Z-amino-l-benzimidazole carboxylic acid, MnCla (0.05) 1 zramino-l-benzimidazole carboxyllc acid,

' methyl ester (0.1) (prepared. by methyl ester, manganese complex.

method of Example 1).

11 do ZI1(AO)2 (0.05) 1 z-amino-l-benzimidazole carboxylic acid,

7 methyl ester, zinc complex.

1 do OaOh (0.0 5) I 1 2-amino-l-benzimidazole carboxyllc acid,

1 a methyl ester, calcium complex.

13 do FcClr (0.05); 1 Z-amino-l-beuzimidazole carboxyllc acid,

- 1 methyl ester, ferrous complex.

14 (lo I '0001; (0.05); 1 Z-amino-l-benzimidazole carboxylic acid,

a methyl ester, cobalt complex. l5 E-chloro-Z-benzimidazolc carbamic acid, Came) H O (0 Y 5-Ch10l'O-2'benZ1 1dflZO1e carbamic acid,

methyl ester (0.1) (prepared by Naoofi a 2) v 2 methyl ester, 1:1 hydroxy copper commethod-of Example 2). l f plex mouohydrate. 16 M1101: (0.05) 4 5-chloro-2-benzimidazole carbamic acid,

. ,r j methyl ester, manganese complex.

17 5-chloro-2'-amino-l-benzimidazolecab Came) O (0 1) 5-chloro-2-amino-1-benzimidazole carhoxboxylicacid, methyl ester (01) (pre Naoofi a 2) 3 ylic acid, methyl ester 1:1 hydroxy I pared by method of Example 1). a copper complex monohydrate.

' 18 do Zn(Ac)i (0.05) 1 5-ch1oro-2-aminc-l-benzimidazole carboxylic acid, methyl ester, zinc complex.

19 5-nitro-2-ami1101-beuzimidazole car-box-. Cums) H 0 (o 1) 5-nitro-2-amino-1-benzimidazolc carboxylic acid, methyl ester (0.1) (prepared 5: a 2) 3 ylic acid, methyl ester, 1:1 hydroxy by method of Example 1); r 1 copper complex monohydrate.

20 do 0801: (0.05)... 1 5-nitr0-2-amino-1-benzimidazole carbox- I ylic acid, methyl ester, calcium comp ex. 21. 5-nitro-2-benzimidazole carbamic acid, Cumc) H 0 (o 1) 5-nitro-2-benzimidazole carbamic acid, et yl e ter (0.1) (p epa e y Naocfi a 2) 2 methyl ester, 1:1 hydroxy copper method oi Example 2). a complex monohydrate. 22 do; FeQlz (0.05).-- 4 5-nltro-2-beuzimidazole carbamlc acid,

. methyl ester, ferrous complex. 5-methoxy-aaminoel-benzimidazolecare Cumc) H 0 (0 1) 5-methoxy-2-amino-1-benzimldazole carboxylic acid, methyl ester (0.1) v(pre- Naoofh a 2) 3 boxylic acid, methyl ester, 1:1 hydroxy j pared by method of Example 1). copper complex monohydrate. '24 .52methoxy-z-benzimidazole' carbamic Cums) O (0 1) 5-meth0xy'2-benzimidaz0le carbamic acid, methylester (0.1) (prepared by Naocfi 2) 2 acid, methyl ester, 1:1 hydroxy copper method of Example 2). a complex monohydratc. 25 do M1101: (0.05) 5 methoxy 2 benzimidazole carbamlo I v g 7 apid, methyl ester, manganese comp ex. 26 4 methyl-2-amlno-l-benizimidazole car- 7 4-methyl-2-amino-1-benizimidazole carboxylic acid, methyl ester (0.1) (pre- }g g 6g 3% 3 boxylic acid, methyl ester, 1:1 hydroxy pared by method oi-Example 1). copper complex monohydrate.

27 (in Zn(Ac); (0.05) 4-methyl-2-amino-1-benzimidazole carboxylic acid, methyl ester, zinc contplex. v

M00100 Ex. Starting Materials (moles) x .of Product No. Ex armple 28.-.-.- 4-methyl-2-benzimidazole carbamlc acid, 4-meth l-z-benzimldazole carbamic acid Ou(Ac)r-H 0 (0.1 Y gggggg pggg gtgp by lNaoom (6.2) 2 gggg ggggggggg copper 29 do CaCl, (0.05) 4 4-methyl-2benzimidazole carbamic acid, methyl ester, calcium complex. I 30 5,6-dichloro-2-amino-l-benzimidazole C A 5,6-dichloro-Z-amino-i-benzimidazole carggigggiycbac ig.flingthfikesgagleqil) 38 F (M) 3 boxylic acid,1methyl efiteg, 1:1 hydroxy y e 0 0 a co or corn e mono rat 31 5,6-dichloro-2-benzimidazole carbamic pp p X y 6 acid, methyl ester (0.1) (prepared by mgthod of Example 2).

4,5,6-tribromo-2-amino-1-benzimidazole cumorngo (01 1) NaO carboxylic acid, methyl ester (0 FeCh (0.05)

CHs (0.2)--- (pgepared by method of Example 1).

4,5,6-tribromo-z henzilnidazole carbamic acid methyl ester (0.1) (prepared by method of Exam le 2).

I 2-amino-1-benzimi azole carboxylic acid,

Z-benzimidazole carbamic acid, B;chloroof Example 2).

2amino 1-benzimidazolecarboxyllcacid allyl ester (0.1) (prepared by metho oi Exam 1e 1).

z-benzimi azole carbamlc acid allyl ester (0.1) (preparedby method of Example 2).

z-amlndl-benzimidazole carboxylic acid,

tertiary amyl ester (0.1) (prepared by method of Example 1).

}Cu(Ac)a-H2O (0.1)

NaOOHa 0.2

Pump-mo (0.1)

Naocm (0.2).. znomuoos) }Cu(A0)z'HzO (0.1

moon. (0.2

{Cu(A0)z-Hn0 (0.1)

NSOCHS (0.2)

Cu(A0)2-H20 (0.1) N aOOHs (0.

Cu(Ac)2'H2O (0.1) NaOCHa (0.2)

cld, methyl ester, 1:1 hydroxy copper complex monohydrate. 5,6 dichloro 2 -benzimidazole carbamic acid, methyl ester, ferrous complex. {4,5,6-tribrom0-2-amino-l-benzimidaz0le v {5,6-dichloro-2 -benzimidazole carbamic carboxyllc acid, methyl ester, 1:1 hydroxy copper complex monohydrate. 4,5,0-tribromo-2-amino-l-benzimidazole carboxylic acid, methyl ester, cobalt complex. 4,5,6-trlbromo-2-benzimldazole carbamic acid, methyl ester, 1:1 hydroxy copper complex monohydrate.

complex monohydrate. 2-amino-l-benzimidazole carboxylic acid,

B-chloroethyl ester, zinc complex.

ethyl ester, 1:1 hydroxy copper complex monohydrate. 2-amino-1-benz1midazole carboxylic acid,

allyl ester 1:1 hydroxy copper com- --p lcx mono ydrate. 2-benzimidazole carbamlc acid, allyl ester, calcium complex.

acid, methallyl ester, 1:1 hydroxy copper complex monohydrate.

{4,5,6-tribromo-2-benzimidazole carbamic The following examples demonstrate the formulation of fungicidal compositions of the present invention and their use in the control of fungi:

The active ingredient is first blended with the minor diluent and micropulverized, then mixed with the major diluent and reblended until substantially homogeneous.

This fungicidal composition, when applied to apple foliage at the rate of 10 pounds active ingredient per acre,

prevents powdery mildew (Podosphaera leucotricha).

S-nitro 2 amino l benzirnidazole carboxylic acid,

Example 49 Percent methyl ester, zinc plex Tobacco dust This compound is formulated into a fungicidal dust by blending the listed ingredients together and passing them through a micropulverizer.

This fungicidal composition, when dusted on the foliage of pear trees at the rate of 10 lbs/acre of active ingredient, prevents pear powdery mildew (Podosphaem leucotricha).

Z-amino-l-benzimidazole carboxylic acid, B-chloroethyl ester, 1:1 hydroxy copper Z-beuzimidazole carbamic acid, fl-chlor0-.

The above dust composition, when dusted on apple trees at the rate of 10 pounds of active ingredient per acre prevents apple scab (Venturia inaequalis).

Example 51 Percent S-nitro-Z-benzimidazole carbamic acid, methyl ester, cobalt complex 50.00

Alkyl naphthalene sulfonic acid, Na salt Low viscosity methyl cellulose Kaolin clay This wettable powder, when dispersed in water at a concentration of 2 pounds per 100 gal. of water and sprayed on cucumber foliage at the rate of 100 gal/acre,

prevents powdery mildew (Erysiphe czchoracearum).

Example 52 Percent S-methoxy 2 amino 1 benzimidazole carboxylic acid, methyl ester, 1:1 hydroxy copper complex monohydrate 50.00 Alkyl naphthalene sulfonic acid, Na salt 0.75 Sodium lignin sulfonate 1.00

Diatomaceous silica 48.25

mesa-gene 11 This wettable powder, when dispersed in water at a concentration of 2 pounds per 100 gal. of water and sprayed on pear trees at the rate of 200 gal. per acre, prevents pear scab (Venturia pyrina).

Example 53 S-methoxy-Z-benzimidazole carbamic acid, methyl ester, 1:1 hydroxy copper complex monohydrate Alkyl naphthalene sulfonic acid, Na salt 1.00 Sodium lignin sulfonate 1.00 Diatomaceous silica 23.00

This wettable powder is dispersed in waterat a concentration of 0.2% active ingredient. This composition when sprayed on rose foliage prevents powdery mildew (Sphaerotheca humuli) Example54 v Percent 4-methyl-2-amino-l-benzimidazole carboxylic acid,

methyl ester, calcium complex 75.00 Alkyl naphthalene sulfonic acid, Na salt] 1.00 Methyl cellulose I v Diatomaceous silica Q, 23.75

This wettablepowder, 0.2% concentrationactive in 11" water, when sprayed on grapes prevents powdery mildew (Uncinula necator).

7 I claim; A compound represented by the formula Percent I1 1 wherein X is selected from the group consisting of hy-r d rogen, halogen, nitro, alkyl groups containing 1 through 6 carbon atomsland alkoxy groups. containing 1 through 6 carbon atoms; n is a whole positive integer less than 5; one Q is hydrogen; one Qis -COOR where "R is an aliphatic group of less than 6 carbon atoms; and

the other Q is a cation that forms a compound selected from the group consisting of asaltand a chelate with the ester molecule. 7 .7 v

References Cited in the file of this patent Pellizzari: Chem; Abstracts, vol; '14, p. 169 (1920).

Murray et al.: J. Am. Chem. Soc., vol. 56, pp. 144- Ridi et al.: Chem. Abstracts, vol. 49; m 4658 19 5s). 

